JPH02173Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention includes a gripping sleeve and a handpiece for a dental treatment work tool held in the head at the tip of the gripping sleeve. The present invention relates to a dental handpiece having a drive body and including an electric light source integrated therein.

PRIOR ART AND PROBLEMS TO BE SOLVED BY THE INVENTION Together with the conduit for the supply medium, the light source is an intermediate member which is replaceably provided between the gripping sleeve and the supply hose for the supply medium for the handpiece. located within. Light from the light source is directed through a strand-shaped photoconductor disposed inside the gripping sleeve to the head, where it is projected from the gripping sleeve toward the dental treatment tool. The light source is also turned on and off by compressed air driven air switch means.

The dental handpiece of the above model is manufactured by the firm Midwest American Shokai.
It is known from the sales brochure HP 013-879-2011 published by American. In order to replace a dental treatment device with a conventional handpiece without an integrated light source of the type mentioned above, with a device incorporating a light source in the handpiece, the collective connection of the entire handpiece and supply hose must be replaced. was found to be necessary. However, because of the large number of handpiece connector fittings and supply hoses, which are of different constructions and of different lengths, such replacement poses considerable problems. Furthermore, it is often necessary to provide additional suitable connections for electrical conduits. Furthermore, in all of the above, inspections have to be carried out in many places due to possible defects or failures in the installation of the light source due to the separate arrangement of the intermediate member and the air switch means. , it must also always be considered to overcome this drawback, which is very complicated and time-consuming.

Additionally, a similar dental handpiece is disclosed in US Pat. No. 3,634,938, in which a replaceable intermediate member containing a light source is also disposed between the gripping sleeve and the supply hose. It is evident that this intermediate part always has a large diameter compared to the gripping sleeve and is also very cumbersome with respect to manipulation of the handpiece. This is because at the end of the circumferential surface of the intermediate part it is provided with a connection for a strand-shaped photoconductor, which projects at least partially outside the gripping sleeve, and also provided with an electrical conduit for a light source. It is from. Furthermore, this electrical conduit is required to be a separate cable leading from the handpiece to a transformer located remotely and to have a manual switch to connect the transformer to the power source. In this kind of handpiece,
It is also relatively easy to construct the intermediate member with the light source to put it into operation. However, this large sized intermediate member rests uncomfortably in the curvature between the thumb and index finger during operation of the handpiece. Furthermore, when the handpiece is put into operation, the lighting equipment of the handpiece must be switched on by a separate manual switch, which is cumbersome. The main disadvantage of this known handpiece is also that, due to a possible rupture in the light source device, the inspection has to be carried out in many places, which is very time consuming.

It is therefore an object of the present invention to provide a dental handpiece of the above-mentioned type which does not require any modification or installation addition to the handpiece itself or to the supply hose during the exchange of the dental treatment device in the manner described above. The purpose is to provide handpieces for It will thus be ensured that the dental handpiece can be utilized with or without an integrated light source, identical to the usual supply hose and its connecting members.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the handpiece of the present invention includes a gripping sleeve and an inner part of the handpiece for a dental treatment work tool held in the head portion at the tip of the gripping sleeve. and an intermediate member that contains an electrical light source for the handpiece and serves as a plumbing connection for the medium to be supplied to the handpiece, the intermediate member being connected to the gripping sleeve. The light source is exchangeably arranged between a supply hose for the medium, and the light of the light source is guided into the region of the head of the handpiece via a strand-shaped photoconductor arranged in the gripping sleeve. In a handpiece which also includes compressed air operated air switch means for flashing the light source, the intermediate member has therein the light source, the air switch means and the media conduit. and a first media connector for connecting the media conduit to the media supply path in the supply hose at the end of the supply hose, and the gripping sleeve has a media passage in the gripping sleeve at the end of the intermediate member. a second media connector connecting the media to the media conduit, the gripping sleeve being configured to be directly connectable to the supply hose, and the second media connector having the same shape as the first media connector. The gripping sleeve is formed such that when the gripping sleeve is directly connected to the supply hose, the medium passage is connected to the medium supply passage via the second medium connector.

(Embodiments) A detailed description of typical embodiments of the present invention will be described with reference to the accompanying drawings.

The dental handpiece 1, which is shown in an exploded state in FIG. Including the driving body. This drive body can be composed of an electric motor, an air motor, or an air turbine, which has a hollow rotating shaft on which the dental treatment working tool 4 can be attached. Inside the gripping sleeve 2, along its axial direction, a medium channel (not shown) and a strand-shaped photoconductor 5 are arranged, which can be formed, for example, from a bundle of photoconductor fibers. and it protrudes outward from the gripping sleeve 2 at the connecting position between the gripping sleeve 2 and the head part 3, and the photoconductor 5
A beam of light emitted from is projected onto the surface of the working tool 4 used, essentially at the location of the tooth to be treated.

As can be seen from Figure 1, the gripping sleeve 2
A cylindrical intermediate member 6 can be fastened to the tail end of the member 6 by a first nut member 8 provided at the tip of the member 6, and the outer periphery of the tail end of the intermediate member 6 A second nut member 12 having a threaded portion 9 formed therein and a supply hose 11 provided at its tip.
Further, both the nut members 8 and 12 are made of the same standard, so that the gripping sleeve 2 can be directly connected to the supply hose 11 by the second nut member 12.

The supply hose 11 is provided with a plurality of medium supply paths (not shown) therein, and correspondingly, a plurality of medium pipes 18 are provided in the intermediate member 6 as shown in FIG. A first media connector 12 protruding from the end connects the media conduit 18 to the media supply route, and connects the media passage in the grip sleeve 2 to the media conduit 18 at the tail end of the gripping sleeve 2. When the gripping sleeve 2, the intermediate member 6, and the supply hose 11 are connected in series as described above, the intermediate member 6 functions as a piping joint for the medium and the supply The medium was supplied to the gripping sleeve 2 from the hose 11. Then, both the medium connectors 7 and 12 are formed in the same shape, and the gripping sleeve 2 is connected to the supply hose 11 as described above.
When the gripping sleeve 2 is directly connected to the medium supply path in the supply hose 11 via the second medium connector 7
The media passages within are now connected.

At the center of the main body 26 of the intermediate member 6, a ninth
As clearly shown in the figure, a substantially semicircular notch 13 is formed, and a first
A semi-cylindrical socket 14 for a light bulb 15 as a light source shown in FIGS. 1 to 14 is attached. The socket 14 contacts the front and rear sides of the notch 13 and terminates in a close fit with the circumferential surface of the main body 26 of the intermediate member 6. The light bulb 15 is attached to the socket 14 so as to protrude from its tip surface,
The light bulb 15 attached to the socket 14 can be inserted into a hole 16 in the intermediate member 6 extending forward from the notch 13, and when the intermediate member 6 is coupled to the gripping sleeve 2, the light-conducting The rear end of the body 5 is inserted into the opening at the tip of the hole 16 and the light bulb 1 is inserted.
I made it face 5.

An outer cylinder 17 made of an insulating material is fitted onto the intermediate member 6 so as to be slidable in the axial direction.The notch 13 is covered with the outer cylinder 17, and the socket 14 is inserted into the notch 1.
I tried to keep it within 3. The outer cylinder 17 can be freely removed from the rear end side of the intermediate member 6, and can be removed from the notch 1.
3 by the first nut member 8.

Furthermore, the intermediate member 6 is provided with compressed air operated air switch means for flashing the bulb 15. The pneumatic switch means is composed of a pneumatic actuator section 19 and a contact section which is turned on and off by the pneumatic switch means and will be described in detail later. As shown in FIG. 21, it is disposed at the tail end of the intermediate member 6 adjacent to and axially parallel to the medium conduit 18. To explain this in more detail, the pneumatic actuator section 19 includes a cylinder 20 comprising a through hole formed at the tail end of the intermediate member 6 so as to be located on the same axis as the light bulb 15, that is, the hole 16; Piston 21 inserted into the cylinder 20
The piston 21 is biased toward the rear end of the intermediate member 6 by a coil spring 23 provided around the push rod 22. The tail end of the cylinder 20 is closed by a threaded closing member 24, and a seal ring 25 is installed in a groove on the outer periphery of the piston 21, and a pressure chamber on the rear side of the piston 21 of the cylinder 20 is closed. is sealed. An insulating plate 5 is attached to the tip of the push rod 22.
3 is fixed.

Compressed air is introduced into the pressure chamber of the cylinder 20 via a branch pipe 27 from an air medium pipe 18 adjacent to the cylinder 20 that supplies working air to the drive body. The branch pipe line 2
A check valve 28 is provided at 7 to prevent air from flowing back into the medium pipe 18 . The check valve 28 consists of a ball 29 with a coiled spring 30, which is supported at one end by a retaining ring 32 inserted into a recess in the branch line 27 and at the other end by a retaining ring 32 inserted into a recess in the branch line 27. The ball 29 is pressed against a restricting portion 31 which acts as a valve seat on the inlet side of the valve 27. The hole 33 in the intermediate member 6 for forming the branch line 27 facing the cylinder 20 is closed by a ball 34 .
In the case of an electric motor, for example, instead of having a compressed air-driven driver, the medium line 18 communicating the cylinders 20 can for example be a medium line supplying the working tool 4 with cooling air.

By switching off the working air for the drive body or the cooling air for the working tool 4, the cylinder 2
In order to achieve a delay in the depressurization of the pressure chamber to 0, a variable throttle valve 35 is provided in conjunction with the check valve 28, which throttle valve 35 is configured to reduce the pressure in the cylinder 20 after the sudden closure of the check valve 28. The compressed air contained therein is discharged to the outside little by little.

As a result, the light bulb 15 remains lit for a predetermined period of time like an all-night light.

The throttle valve 35 consists of a threaded pin 36 with a conical tip 37 and can be operated from the outside. The pin 36 forms a restriction at the intersection of the first exhaust passage 38 communicating with the cylinder 20 and the second exhaust passage 39 communicating with the outside.

The pneumatic actuator section 19 acts on the contact section via the push rod 22. Regarding that, Figs. 1 to 7 are similar to Figs. 11 to 19.
The six embodiments shown in FIGS. 23-27 are described in more detail below.

In the first embodiment of the contact portion 40 shown in FIGS. 6, 7, and 11 to 14,
There is a contact piece 48 held within the socket 14 and projecting from the side in a cutout 47 within the socket 14, the contact piece 48 being spaced apart from the terminal 49 of the bulb 15 and extending from the front of the socket 14. It is connected, for example, by soldering, to an electric wire 51 extending rearward from the top. Furthermore, another electric wire 52 is connected to the socket 1.
4 from the front to the rear, and the electric wire 52 is directly fixed or soldered to the other terminal 50 of the light bulb 15.

As can be seen in FIG. 7, the free end of the contact piece 48 projecting into the cutout 47 is dimensioned to follow the forward sliding of the piston 21 under the action of compressed air. The push rod 22 with the insulating plate 53 presses the contact piece 48 against only one terminal 49 of the light bulb 15. While pressing the contact piece 48 against the terminal 49, the current circuit is closed and the bulb 15 is lit.

In a second embodiment of the contact section 41 as shown in FIGS. 2, 3, 15 and 16, the two wires 51, 52 are connected to a connecting head which can be inserted into an elbow-shaped plug 55. It terminates within 54. The bare ends of the wires 51, 52 are connected to connection sleeves 60, 61 embedded in the socket 14 via connector pins 56, 57 inserted into the plug 55.
The electrode pins 58, 5 of the plug 55 can be inserted into the
9 is connected. These connecting sleeves 6
0,61 is connected to the upper surface of the contact piece 62,
63 is soldered to it, for example, to the socket 1.
4 and supported by the lower insulating rod 65. Contact piece 6 shown on the left side of FIG.
2 corresponds to the contact piece 48 of the contact portion 40 of the first embodiment, and the free end of the contact piece 48 protrudes into the cutout portion 47 of the socket 14 so as to face one terminal 49 of the light bulb 15. ing. The other contact piece 63 is the conductor 6
4, it is firmly connected to the other terminal 50 of the light bulb 15.

The third embodiment of the contact section 42 is identical to those of the second embodiment with respect to the contact pieces 62, 63 and the connecting head 54. They are distinguished only by the conductance of the current to the contacts 62, 63. Here, as can be seen substantially from FIGS. 17 to 19, the connecting head 54 is inserted into the upper bulge 66 of the outer cylinder 17, which is slidable on the intermediate member 6. Electrical connections to the contacts 62, 63 are made by horizontal connector pins 71, which are installed horizontally in the bulges 66 at insertion positions 69, 70 of the connection heads 54.
72 connects the socket 14 via vertical connector pins 73, 74 provided perpendicularly to their ends.
This is achieved by being connected to contact rods 75, 76 disposed on the circumferential surface of. These contact rods 7
5, 76 and contact pieces 62, 63, the socket 1
They are fixedly connected by electrode pins 77, 78 embedded in the electrodes 4. The method of operating this contact portion 42 is the same as that of the contact portion 41 described above.

In the fourth embodiment of the contact portion 43 shown in FIG.
A contact piece 81 corresponding to the contact piece 63 shown on the right side of FIG. 16 has the same length as the contact piece 62 on the left side. not connected to. In addition, both contact pieces 62,
The power supply to 81 is the same as in the second embodiment. In the case of the third embodiment, the pneumatic actuator section 1
Push rod 22 of 9 engages both free ends of contact pieces 62, 81 as long as its pressure continues and presses them against terminals 49, 50 of bulb 15.

In the fifth embodiment of the contact section 44 shown in FIG. 24, the conductance of the current from the connection head 54 through the socket 14 supplying the current to the terminals 49, 50 of the bulb 15 is as shown in FIGS. 15 and 16. This is the same as the second embodiment. However, what differs here is the connection between the connecting sleeves 60, 61 and the terminals 49, 50 of the bulb 15. In this case,
One of the connecting sleeves 61 is connected by a conductor 83 to one terminal 50 of the bulb 15, and the other sleeve 60 is connected by a conductor 84 to a conductive headpiece 85 attached to the tip of the push rod 22.

Due to the operation of the pneumatic actuator section 19, the head piece 85 of the push rod 22 closes the light bulb 15.
is pressed by the other terminal 49 of. The current circuit is thus closed.

a coil spring 23 that presses the piston 21 toward the tail end of the intermediate member 6 adjacent to the supply hose 11;
can be omitted if the contact piece 86 is appropriately bent and has a spring force corresponding to the spring force of the coil spring 23, as shown in FIG.

5 above of the contact portions 40, 41, 42, 43, 44
For this embodiment, the electrical wires 51, 52 need to be led through the outside of the supply hose 11 to the intermediate member 6, and from this point of view a plurality of clips 87 for locking the electrical wires 51, 52 are provided on the supply hose 11. Installed. It is assumed that the externally provided electric wire of the type described above is very easily damaged when the handpiece 1 is used. In order to improve the above-mentioned problem, it is proposed that the power source for lighting the light bulb 15 is provided not too far from the handpiece 1 and is furthermore installed in the intermediate member 6 of the handpiece 1. In this way, the length of the external and internal electrical wires of the handpiece 1 can be saved to some extent.

For this purpose, a further recess 88 with a horizontal insulating groove 89 is provided below the bulb 15 and its connecting components in the body 26 of the intermediate part 6, as can be seen from FIGS. 26 and 27. It is provided. A small battery 91 is provided on a bottom plate 90 formed of a conductive material provided at the bottom of this insulating groove 89. Further, a curved plate 92 is fixed so as to cross the longitudinal direction of the insulating groove 89, and the curved plate 92
connects the small battery 9 by means of its central connection head 93.
contact the surface of 1.

A hole is provided in the wall of the main body 26 of the intermediate member 6 and the insulating groove 89 at the height of the bottom plate 90,
A contact pin 99 is inserted into this. An insulating rod 65 is inserted across the entire width of the notch 13, and contact pieces 94, 9 held in the socket 14 are attached to the upper surface of the insulating rod 65.
5 is mounted, and the contact pieces 94 and 95 have protrusions 96 and 97 that pass through the insulating rod 65, respectively. A protrusion 96 of one of the contact pieces 94 contacts a coil spring contact 98 provided in a circular hole at the bottom of the notch 13 . The contact 98 has a contact pin 99 at its lower end.
come into contact with. The other contact piece 95 is connected to one terminal 50 of the light bulb 15 via a conductive wire, and its protrusion 97 is placed in contact with the curved plate 92. When the push rod 22 is pressed against the free end of the contact piece 94 by actuation of the pneumatic actuator section 19, the contact piece 94 contacts the other terminal 49 of the light bulb 15 and the light bulb 15 lights up.

It is possible to replace a used small battery with a new one in the following simple way. That is,
The outer cylinder 17 on the intermediate member 6 is slid backwards towards the supply hose 11, the socket 14 is removed together with the bulb 15 from the cutout 13, and then the curved plate 92 is removed.
By standing aside, the small battery 91 can be easily removed from the insulating groove 89. At the same time, a new small battery 91 can be easily inserted.

While the preferred embodiments of the invention have been shown and described, it is to be understood that various aspects and details may be readily made without departing from the spirit of the invention. Therefore, it is intended that the invention not be limited to the precise forms and details shown, but that it is intended to be covered in nothing but the full scope of the patent claims.

(Effects of the invention) The advantages achieved by the invention are as follows:
This can be confirmed by the use of an intermediate member including a light source and its air switch means. In that, the intermediate member is arranged between the gripping sleeve and the supply hose, creating there a relatively small and compact replaceable light source unit. Since the intermediate member can be easily removed and it contains all of the fault-prone components, namely both the light source and the air switch means, by removing the intermediate member, both can be inspected all at once, and can be easily repaired or replaced as necessary. A further advantage of the present invention is that the supply hose is configured so that it can be directly connected to the gripping sleeve, so that the gripping sleeve and the supply hose can be connected directly to the handpiece even while the intermediate member is being repaired. Can be used as

[Brief explanation of the drawing]

FIG. 1 is an exploded side view generally showing a first embodiment of a dental handpiece with an intermediate member and a connection for a supply hose in full size; FIG. 3 is a right side end view of the intermediate member according to FIG. 2, FIG. 4 is a side view of the intermediate member related to the modification of FIGS. 1 and 2, 5 is a right side end view of the intermediate member according to FIG. 4; FIG. 6 is an enlarged partial sectional side view of the intermediate member according to FIG. 1 with a first embodiment of the contact portion of the air switching means; FIG. Figure 6 -
A line sectional view, FIG. 8 is a - line sectional view of FIG. 6,
FIG. 9 is an enlarged side view of the intermediate member shown in FIGS. 1, 2, and 4 excluding the socket; FIG. 10 is a side view of the outer cylinder inserted into the intermediate member shown in FIG. 9;
11 is a side view of a socket adapted to the intermediate member of the embodiment according to FIGS. 1 and 6, FIG. 12 is a right side end view of the socket according to FIG. 11, and FIG. 13 is a left side view of the socket according to FIG. 11. 14 is a bottom view of the socket according to FIG. 11, FIG. 15 is an enlarged partial sectional side view of the intermediate part according to FIG. 2 with a second embodiment of the contact, and FIG. 16 is a bottom view of the socket according to FIG. 17 is a partial enlarged sectional view of the intermediate member according to FIG. 3 with a third embodiment of the contact portion, FIG. 18 is a sectional view taken along the line - of FIG. 17, and FIG. 18 is an enlarged view of the part shown in FIG.
Figure 22 is a schematic diagram of the gas venting circuit for the pneumatic actuator section.
Figure 3 is an enlarged view of details of the fourth embodiment of the contact part,
Figure 4 is an enlarged view of the details of the fifth embodiment of the contact part, and the second
5 is an enlarged view of details of the contact portion, FIG. 26 is an enlarged partial sectional side view of the intermediate member according to FIG. 15 with a sixth embodiment of the contact portion, and FIG. 27 is a sectional view taken along the line -- in FIG. shows. 1...Hand piece, 2...Gripping sleeve, 3
...Head portion, 4...Work tool, 5...Photoconductor, 6...Intermediate member, 7...Second medium connector, 8...First nut member, 9...Threaded portion, 1
0... Second nut member, 11... Supply hose,
12...First medium connector, 13...Notch, 14...Socket, 15...Light bulb, 16...
Hole, 17... Outer cylinder, 18... Medium pipe line, 19...
Pneumatic actuator section, 20...Cylinder, 2
1... Piston, 22... Push rod, 23
... Coil spring, 24 ... Closing member, 27 ... Branch pipe line, 40, 41, 42, 43, 44 ... Contact section, 47 ... Socket cutting section, 48, 62, 6
3, 81, 86, 94, 95... contact piece, 49, 5
0... Terminal, 51, 52... Electric wire, 54... Connection head, 55... Plug, 58, 59, 78, 7
5... Electrode pin, 60, 61... Connection sleeve,
66... Upper expansion part, 71, 72... Horizontal connector pin, 73, 74... Vertical connector pin,
75, 76...Contact rod, 83,84...Conducting wire, 8
5...Headpiece, 87...Clip.

Claims (1)

[Claims for Utility Model Registration] 1. A gripping sleeve, a driving body disposed in a handpiece for a dental treatment work tool held in the head at the tip of the gripping sleeve, and a drive body for the handpiece. an intermediate member containing an electrical light source and serving as a piping connection for a medium to be supplied to the handpiece, the intermediate member being replaceably disposed between the gripping sleeve and a supply hose for the medium; and the light of the light source is directed to the region of the head of the handpiece via a strand-like photoconductor disposed within the gripping sleeve, and the light source is actuated with compressed air to blink the light source. In a handpiece that also includes an air switch means, the intermediate member has the light source, the air switch means, and a medium conduit therein, and has the medium conduit connected to the supply hose end thereof. The gripping sleeve has a first media connector connecting the media passage in the supply hose to the media conduit, and the gripping sleeve has a second media connector connecting the media passage in the gripping sleeve to the media conduit at the end of the intermediate member. and the gripping sleeve is configured to be directly connected to the supply hose, the second medium connector is formed in the same shape as the first medium connector, and the gripping sleeve is directly connected to the supply hose. A handpiece, wherein the medium passage is connected to the medium supply path via the second medium connector. 2 forming a notch in the center of the intermediate member;
A socket for a light bulb constituting the light source can be attached to the notch, and the light bulb protrudes from the socket toward the gripping sleeve side end of the intermediate member, and has a shaft formed within the intermediate member. The handpiece according to claim 1, which is capable of being inserted into a hole in any direction. 3. The utility model according to claim 2, wherein the socket is made of an insulating material such as plastic, and the contact portion of the air switch means is provided within the socket. handpiece. 4. Utility model registration claim 2 or 3, characterized in that an outer cylinder made of an insulating material that covers the notch is slidably inserted into the intermediate member.
Handpiece as described in Section. 5. The air switch means is connected to one of the medium conduits.
A pneumatic actuator section comprising a cylinder into which compressed air is introduced from two air medium pipes via a branch pipe, and an actuating member consisting of a piston or a membrane actuated by the air pressure in the cylinder, and the actuating member A handpiece according to any one of claims 1 to 4 of the utility model registration claim, characterized in that the handpiece comprises a contact portion that is turned on and off by a switch. 6. The utility model registration claim 5, wherein the pneumatic actuator section is disposed within the intermediate member on an axial extension of the light bulb toward the supply hose. handpiece. 7. The cylinder is formed by an axial through hole in the intermediate member, is closed to the outside by a closing member, and is in communication with the branch pipe line that merges with the air medium pipe line. The handpiece according to claim 5 of the utility model registration claim. 8 Extending from the front of the socket to the rear thereof 2
one of the wires is connected to one terminal of the light bulb, and the other wire is attached to a contact piece attached to the socket such that its free end projects into a cutout in the socket. and the free end of the contact piece is elastically pressed against the other terminal of the bulb by the actuating member of the pneumatic actuator part, and the contact piece and the other terminal connect the contact part. The handpiece according to claim 5 of the utility model registration. 9. A connecting head is provided for connecting the ends of two electric wires while insulating them from each other, and the connecting head is insertable into an elbow-shaped plug having two electrode pins that can be inserted into the socket from the outer circumferential side thereof. A pair of contact pieces to which both the electrode pins are connected are attached to the socket, one contact piece is connected to one terminal of the light bulb, and the free end of the other contact piece is connected to the socket. protruding into the cut-out part so that the free end is elastically pressed against the other terminal of the light bulb by the actuating member of the pneumatic actuator part, and the other contact piece and the other terminal The handpiece according to claim 5, characterized in that the contact portion is configured. 10 The outer cylinder is provided with an upper bulge, a connecting head for insulating and connecting the ends of two electric wires can be inserted into the upper bulge, and a connection head is inserted into the upper bulge. Connector pins are embedded within the socket to respectively connect the ends of the two electric wires to be tied to a pair of axially long contact rods attached around the socket, and further connected to the two contact rods respectively in the socket. Ru1
Attach a pair of electrode pins and a pair of contact pieces respectively connected to both electrode pins, connect one contact piece to one terminal of the light bulb, and insert the free end of the other contact piece into the socket. projecting into the cut-out part of the pneumatic actuator part so that the free end is elastically pressed against the other terminal of the light bulb by the actuating member of the pneumatic actuator part, and the other contact piece and the other terminal The handpiece according to claim 5, wherein the contact portion is configured as follows. 11 A connecting head is provided for connecting the ends of two electric wires while insulating them from each other, and the connecting head is an elbow-shaped connector having a pair of electrode pins each of which can be inserted into a pair of connecting sleeves embedded in the socket. A pair of contact pieces which can be inserted into the plug and are respectively connected to the two connecting sleeves are attached to the socket, and the free ends of the two contact pieces respectively project into cutouts in the socket. The free ends of the contact pieces are elastically pressed against one terminal and the other terminal of the light bulb by the actuating member of the pneumatic actuator section, respectively, and the contact pieces and both terminals are arranged to press the contact pieces together. The handpiece according to claim 5 of the utility model registration, characterized in that the handpiece comprises a part. 12 A connecting head for connecting the ends of two electric wires while insulating them from each other, and the connecting head is an elbow-shaped plug having a pair of electrodes each of which can be inserted into a pair of connecting sleeves embedded in the socket. one of the connecting sleeves is connected to one terminal of the light bulb via a conductive wire, and
The other connecting sleeve is connected via another conductive wire to a conductive head piece connected to the actuating member of the pneumatic actuator portion so as to face the other terminal of the electrode, and the head piece and the other terminal are connected to each other via another conductive wire. The handpiece according to claim 5, wherein the contact portion is comprised of: 13 Utility model registration claim 3, characterized in that the electric wire led to the intermediate member is fixed by a clip attached to the supply hose.
Handpiece as described in Section. 14 The intermediate member has a first nut member for connection with the gripping sleeve at its gripping sleeve side end, and a second nut member provided at the end of the supply hose at its supply hose side end. Claim 1 of the utility model registration claim, characterized in that the gripping sleeve is directly connected to the supply hose by the second nut member, with both nut members having the same standard. The handpiece described in.